/Engine/Source/Editor/StaticMeshEditor/Public/StaticMeshEditorSubsystem.h
Inserts an empty UV channel at the specified channel index on the given LOD of a StaticMesh.
true if a UV channel was added.
bool InsertUVChannel ( [UStaticMesh](API\Runtime\Engine\Engine\UStaticMesh) * StaticMesh, int32 LODIndex, int32 UVChannelIndex )